Screen 1 – 3-Year Time Skip & Training
After King Piccolo's defeat, Goku (now 18) and Sonic (now 13) train under Kami.
Just like Goku received a Power Pole extension and martial arts training, Sonic also learns to focus his Chaos Energy in new ways.
Kami gifts Sonic the Blue Chaos Emerald as a symbol of trust — this one enhances speed, defense, and energy control, balancing out the raw destructive power of the red Emerald.
Both prepare for the 23rd World Martial Arts Tournament. Piccolo Jr. has also entered to take revenge.
Screen 2 – Tournament Begins
Adult Chi-Chi shows up, and Goku doesn't recognize her at first (same funny moment as in canon).
Sonic teases Goku, but doesn't join the tournament — instead, he watches in the stands, ready to intervene if something goes wrong.
Goku also encounters Cyborg Mercenary Tao, and both Goku and Sonic are shocked at how he survived and turned mechanical.
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Screen 3 – Highlight: Goku vs Tien
During Goku's fight with Tien, the announcer notices something strange: Goku seems "lighter" than usual.
Goku casually takes off his shirt, wristbands, and boots:
Shirt = 20 kg (44 lbs)
Each wristband = 2 kg (4.5 lbs each, 4 kg total)
Each boot = 5 kg (11 lbs each, 10 kg total)
The arena floor cracks under the impact.
Sonic, grinning, also takes off his own weighted gear (Kami trained him with similar hidden weights). His shoes and gloves slam down, shattering the stone tiles.
Both show how much they've grown. Goku defeats Tien again, just like in the original.
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Screen 4 – Goku & Sonic vs Piccolo Jr.
Piccolo Jr. eats Kami, planning to fuse and gain his full potential.
The final match begins: Goku vs Piccolo Jr. — but this time, Sonic jumps in alongside Goku when Piccolo grows giant.
Team battle moment:
Goku keeps the pressure with martial arts.
Sonic uses Spin Dash to knock Piccolo off balance, creating openings.
Together they manage to free Kami from inside Piccolo, weakening him.
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Screen 5 – Final Clash
The fight narrows back to 1 vs 1: Goku vs Piccolo, but Sonic refuses to just sit by.
When Piccolo fires his deadly chest laser aimed at Goku, Sonic blocks it with a Spin Dash shield and kicks Piccolo back.
Thanks to Sonic's interference, Goku avoids getting impaled (like in canon).
Goku finishes the fight with the same legendary chest-first headbutt, launching Piccolo out of the ring.
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Screen 6 – Aftermath
Goku wins the 23rd World Martial Arts Tournament.
Sonic and Goku both choose not to kill Piccolo Jr., showing mercy.
Sonic says, "Sometimes even enemies can change if you let them."
Piccolo storms off, vowing revenge, but secretly respects the two fighters' strength.
Goku marries Chi-Chi, while Sonic stays close as his brother-in-arms.